Transdiagnostic Versus Diagnosis-specific Cognitive-behavioral Therapy

Inclusion Criteria: * 18-65 years of age, * Being able to speak Swedish without interpreter support, * A principal diagnosis of panic disorder, generalized anxiety disorder, social anxiety disorder, obsessive-compulsive disorder, or posttraumatic stress disorder, and * Pharmacological treatment (if any) that is stable six weeks prior to treatment start Exclusion Criteria: * Current diagnosis of psychotic disorder, bipolar disorder, or moderate to severe substance use disorder, * Moderate to severe risk of suicide, * Psychiatric, somatic, or social problems which require other management or intervention than cognitive-behavioral therapy, and * Other simultaneous psychological treatment